Since 2007, 3D full-field strain measurement based on digital image correlation method (DIC) , has been explosive development and application [see STRAIN Journal editorial in 2008], widely used in research in various disciplines, such as material mechanics , biomechanics, fracture mechanics, micro-nano-strain measurement, macroscopic large deformation measurement, performance testing of new materials. Welcome to universities and research institutes, based on digital image correlation method "XJTUDIC dynamic three-dimensional digital speckle strain measurement and analysis system" cross-disciplinary research, cooperation, experimental three-dimensional audience response. With the popularity of a variety of numerical simulation software, three-dimensional deformation and strain measurement in the more urgent. Various numerical simulation results with the actual situation there is a deviation, an urgent need for actual measurement of deformation and strain values to be corrected. Three-dimensional deformation measurement by optical technology can replace the traditional strain gauges and displacement sensors, optical three-dimensional deformation measurement technique is not only easy to use, fast implementation three-dimensional deformation and strain measurement, strain gauges and can be completed and the displacement sensor measurements can not be achieved. Can be widely used in sheet metal forging measurement, material testing, biomechanical testing, mold testing, large deformation and so on. XJTUDIC full-filed dynamic strain: Strain Grand Rapid measurement of three-dimensional mechanical properties. XJTUSD static deformation measurements: for large size (<100m) large deformation measurements. XJTUDA dynamic deformation measurements: rapid measurement of dynamic three-dimensional deformation,. XJTUSM sheet metal strain measurement: measuring three-dimensional strain in sheet metal forming.

Key technologies and features

Multi-camera multi-format camera flexible self-calibration technique. Solve the traditional calibration method requires high-precision calibration block, to achieve a quick, convenient, high-precision camera calibration is the basis of three-dimensional photogrammetry and core. Independent research and development of industrial close-range photogrammetry technology. Portable CMM measuring range of several mm to tens of meters, and self-developed three-dimensional surface scanning system work closely together to achieve a more visually scan mosaic, mosaic surface scanning to eliminate the accumulated error. Only three similar international system to achieve industrialization and product of. Three-dimensional optical surface scanning and photogrammetry integration of three-dimensional scanning technology to solve a number of splicing, as the scanning point cloud generated by the cumulative error and realizes the automatic stitching, to meet the automation and precision industrial measurement control requirements. Only a similar international system. A series of key technology to achieve a breakthrough series of three-dimensional camera system. Realized the camera calibration, 3D reconstruction, point cloud processing, deformation analysis techniques. Seven developed system for three-dimensional coordinate measurement, point cloud acquisition, three-dimensional static deformation and dynamic strain audience measurement and analysis, and strain analysis of sheet metal forming. The international community has only one unit of the technology. Systems and products of industrialization: the aerospace, automotive, machinery and other industries to promote the application of mobile phone to tens of meters to meet dozens of aircraft measurements mm testing requirements.

Independently developed a series of industrial three-dimensional photographic measurement system

XJTUDP industrial three-dimensional photogrammetry: Portable optical CMM, surface scanning used alone or integrated, once all the key measurement point coordinate. A few millimeters objects ~ tens of meters

XJTUSO small three-dimensional optical surface scanning system designed for small parts of the reverse scan and rapid detection of three-dimensional full-size.

XJTUOM INSPECTOR point cloud to deal with than the detection system: massive cloud of splicing, overlapping surface integration, noise reduction, and the number of point cloud and CAD model of three-dimensional comparison test.

XJTUDIC is a non-contact optical 3D deformation measuring system based on DIC (Digital Image Correlation). XJTUDIC analyzes, calculates and documents deformations. The graphical representation of the measuring results provides an optimum understanding of the behavior of the object to be measured.